CN107400809A - The zirconium strontium compound microalloyed Al-Si-Cu-based cast aluminium alloy gold of high tough corrosion-resistant low silicon content and preparation method - Google Patents
The zirconium strontium compound microalloyed Al-Si-Cu-based cast aluminium alloy gold of high tough corrosion-resistant low silicon content and preparation method Download PDFInfo
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Abstract
High tough corrosion-resistant low Si contents Al Si Cu systems cast aluminium alloy gold of a kind of Zr and Sr combined microalloyings and preparation method thereof, it is characterized in that described aluminium alloy is mainly by aluminium, silicon, 1.39~1.43% copper, 0.397 ~ 0.403% zinc, 0.271~0.272% zirconium and 0.0083~0.0085% strontium that mass percent is 3.55~3.65 %(Sr)Composition, surplus is aluminium and a small amount of impurity element.Described preparation method includes successively:(1)850 DEG C are warming up to after pure Al and Al Si intermediate alloys are melted, intermediate alloy is then sequentially added, pure Zn is added after thawing;(2)After all intermediate alloys and metal molten, 750 DEG C are adjusted the temperature to, is escaped without gas, removing slag and pour into after standing insulation is preheated in 300 DEG C of metal die ingot of casting.Aluminium alloy as-cast structure of the present invention is fine and close, and cast alloy actual measurement room temperature non-notch impact flexibility average value is 35.95J/cm2。
Description
Technical field
The present invention relates to a kind of aluminum alloy materials, especially a kind of tough corrosion-resistant Al-Si-Cu systems Cast aluminium alloy of novel high-strength
Gold and preparation method thereof, the high tough corrosion-resistant low Si contents Al-Si-Cu of specifically a kind of Zr and Sr combined microalloyings
It is cast aluminium alloy gold and preparation method thereof.
Background technology
Al-Si(-Cu)It is that cast aluminium alloy gold is currently to apply most cast aluminium alloy materials, this kind of alloy in the industry
Numbering have:Domestic YL102(AlSi12)、YL112(AlSi8.5Cu3.5)、YL113(AlSi811Cu3), it is Japanese
ADC12(AlSi11Cu3)、ADC10(AlSi8.5Cu3.5)And the A380 in the U.S.(AlSi8.5Cu3.5)Deng these alloys tool
There are excellent casting character, higher intensity and good corrosion resistance, but its plasticity, toughness are relatively low, limit
It is applied.
Al-Si(-Cu)It is the mechanical property and its second phase in organizing of cast aluminium alloy gold(Silicon is equal)Form, chi
Very little, distribution is closely related.Refinement Si phases are to reduce Si isolating so as to improve Al-Si with respect to matrix Al(-Cu)It is Cast aluminium alloy
The effective way of golden performance.Strontium(Sr)Element is a kind of effectively long-acting alterant in aluminium alloy, not only can be effectively thin
Change Al-Si(-Cu)Be the Si phases in cast aluminium alloy gold, and can be effectively in refining alloy FeSiAl5Etc. compound phase.Zirconium
(Zr)Element is a kind of and the strong 3d transition elements of Al affinity, is added in aluminium alloy, the zirconium in alloy graining process(Zr)
Element forms A1 with Al3Zr(1580 DEG C of fusing point)Deng high-melting-point thing phase, Heterogeneous Nucleation effect is played in the follow-up solidification to alloy,
Not only refining alloy as cast condition matrix, promote tiny equiax crystal to be formed, and improve the mobility and element point of liquid alloy
Cloth uniformity, therefore, Zr, Sr combined microalloying can not reduce the performances such as alloy casting character, intensity, corrosion resistance
While, greatly improve the plasticity and toughness of alloy.
Up to the present, there has been no a kind of the high tough of Zr and Sr combined microalloyings with independent intellectual property right in China
Al-Si(-Cu)It is that cast aluminium alloy gold and preparation method thereof is available, this constrains China's high performance casting aluminium to a certain extent
The manufacturing development of alloy and products thereof.
The content of the invention
The purpose of the present invention is to be directed to current Al-Si(-Cu)It is cast aluminium alloy gold plasticity, the problem of toughness is relatively low, invention
One kind by adjusting Si, Cu constituent content, while adds zirconium on the basis of Al-Si-Cu systems cast aluminium alloy gold composition design
(Zr)And strontium(Sr)Element carries out composite alloying, is not reducing alloy casting character(Mobility)While, high-efficiency fine chemical combination
Si phases and compound phase in gold, plasticity, the toughness of alloy are greatly improved, obtain one kind and have excellent casting character and obdurability concurrently
The Al-Si-Cu systems cast aluminium alloy gold of corrosion resistance, while its preparation method is provided.
One of technical scheme is:
A kind of high tough corrosion-resistant low Si contents Al-Si-Cu systems cast aluminium alloy gold of Zr and Sr combined microalloyings, its feature exist
In:It is mainly by aluminium(Al), silicon(Si), copper(Cu), zinc(Zn), zirconium(Zr)And strontium(Sr)Composition, wherein, silicon(Si)Quality hundred
It is 3.55~3.65 % to divide ratio, copper(Cu)Mass percent be 1.39~1.43%, zinc(Zn)Mass percent for 0.397 ~
0.403%, zirconium(Zr)Mass percent be 0.271~0.272%, strontium(Sr)Mass percent for 0.0083~
0.0085%, surplus is aluminium and a small amount of impurity element(Such as the iron that mass percent is 0.153~0.158%), the quality of each component
Percentage sum is 100%.
The two of technical scheme are:
A kind of preparation side of the high tough corrosion-resistant low Si contents Al-Si-Cu systems cast aluminium alloy gold of Zr and Sr combined microalloyings
Method, it is characterized in that its preparation process includes successively:
(1)First, 850 ± 10 DEG C are warming up to after pure Al and Al-Si intermediate alloys are melted, is then sequentially added among Al-Cu
Alloy, Al-Zr intermediate alloys and Al-Sr intermediate alloys, intermediate alloy to be added and pure Al add pure Zn after melting;
(2)Secondly, after all intermediate alloys and metal molten, 750 ± 10 DEG C are adjusted the temperature to, carbon trichloride refining is added and removes
Until being escaped without gas, remove slag after 5~10 min of standing insulation and pour into be preheated in 300 DEG C of metal die is cast into gas
Ingot, that is, obtain the high tough corrosion-resistant low Si contents Al-Si-Cu systems cast aluminium alloy gold of Zr and Sr combined microalloyings.
Si mass percent is the quality hundred of Cu in 10.21%, Al-Cu intermediate alloys in described Al-Si intermediate alloys
It is 4.11% to divide the mass percent that ratio is Zr in 50.12%, Al-Zr intermediate alloys, Sr quality percentage in Al-Sr intermediate alloys
Than for 9.89%.
Beneficial effects of the present invention:
(1)It is 35.95J/cm present invention obtains a kind of room temperature non-notch impact flexibility2(By GB/T 229-2007 metal materials
Expect Charpy pendulum impact test method);Mechanical properties are 194.0475MPa, elongation percentage 17.475%;Hardness is
83.567HV, electrical conductivity are 43.46625% IACS;It is equal when soaking 93 h at a temperature of 37 DEG C in the 3.5% NaCl aqueous solution
Even corrosion rate(By GB 1024-88 Uniform Corrosion Method of Laboratory Immersion Test methods)For 0.216770566658317
Mm/y high tough corrosion-resistant Al-Si-Cu systems cast aluminium alloy gold.
(2)The present invention is contained on the basis of Al-Si-Cu systems cast aluminium alloy gold composition design by adjusting Si, Cu element
Amount, while add zirconium(Zr)And strontium(Sr)Element carries out combined microalloying, ensures alloy group not reducing alloy casting character
While knitting compactness, Si phases and compound phase in alloy have efficiently been refined, the toughness, intensity, modeling of alloy greatly improved
Property and corrosion-resistant.
(3)The Si phase sizes of Al-Si-Cu systems of the present invention cast aluminium alloy gold are at 1-2 μm, and shape is in granular form or corynebacterium,
And draw ratio is less than or equal to 2.
(4)Impacted present invention obtains a kind of with stretching fracture in the high tough resistance to of the typical ductile rupture of dimple feature
Corrode Al-Si-Cu systems cast aluminium alloy gold.
(5)The invention discloses a kind of composition of high tough corrosion-resistant low Si contents Al-Si-Cu systems cast aluminium alloy gold and preparation
Method, the external technology blockage to high performance casting aluminium alloy is broken to a certain extent, Chinese large-sized complex thin-wall can be met
The manufacture demand of high tough corrosion-resisting aluminum casting alloy product.
(6)The present invention obtains preferable preparation method by largely testing, and is added in order especially by using
The method of each intermediate alloy and simple metal controls each component content, can be readily derived by the technique of the present invention satisfactory
Aluminum alloy materials.
Brief description of the drawings
Fig. 1 is the high tough corrosion-resistant Al-Si-Cu systems casting aluminium of the Zr and Sr combined microalloyings of the embodiment of the present invention one
The metallographic structure optical microscope photograph of alloy.
Fig. 2 is the high tough corrosion-resistant Al-Si-Cu systems casting aluminium of the Zr and Sr combined microalloyings of the embodiment of the present invention one
The metallographic structure electron scanning micrograph of alloy.
Fig. 3 is the high tough corrosion-resistant Al-Si-Cu systems casting aluminium of the Zr and Sr combined microalloyings of the embodiment of the present invention one
The room temperature non-notch impact flexibility performance test fracture surface of sample electron scanning micrograph of alloy.
Fig. 4 is the high tough corrosion-resistant Al-Si-Cu systems casting aluminium of the Zr and Sr combined microalloyings of the embodiment of the present invention one
The room temperature tensile test sample Fracture scan electron micrograph of alloy.
Fig. 5 is the high tough corrosion-resistant Al-Si-Cu systems casting aluminium of the Zr and Sr combined microalloyings of the embodiment of the present invention one
The corrosion resistance test sample surface Scanning Electron microphotograph of alloy.
Embodiment
The present invention is further illustrated with reference to the accompanying drawings and examples.
Embodiment one.
As shown in Fig. 1,2,3,4,5.
A kind of high tough corrosion-resistant low Si contents Al-Si-Cu systems cast aluminium alloy gold of Zr and Sr combined microalloyings, it is logical
Following methods are crossed to be prepared:
First by the pure Al of A00 grades(99.79%Al, 0.14%Fe, 0.04%Si)With Al-Si (89.62 %Al, 10.21%Si,
0.17% Fe, all components of the present invention represent that those skilled in the art can be obtained by conventional algorithm using mass percent
Quality and weight corresponding to each component, similarly hereinafter, it is impurity that all components, which is added the part less than 100%) rise after intermediate alloy fusing
Then temperature is sequentially added and closed among Al-Cu (49.62%Al, 50.12%Cu, 0.15%Fe, 0.11%Si) to 850 ± 10 DEG C
Gold, Al-Zr (95.69%Al, 4.11%Zr, 0.20%Fe, 0.10%Si) intermediate alloys and Al-Sr (89.86%Al, 9.89%
Sr, 0.15%Fe, 0.10%Si) intermediate alloy, add pure Zn after intermediate alloy to be added and pure Al thawings;Treat all centres
After alloy and metal molten, 750 ± 10 DEG C are adjusted the temperature to, adds carbon trichloride refining degasification until being escaped without gas, it is quiet
Remove slag and pour into after putting the min of insulation 5~10 and be preheated in 300 DEG C of metal die ingot of casting;A kind of Zr and Sr is obtained to answer
Close the high tough corrosion-resistant Al-Si-Cu systems cast aluminium alloy gold of microalloying.
The high tough corrosion-resistant Al-Si-Cu systems cast aluminium alloy gold of the Zr and Sr combined microalloyings of the present embodiment is through spectrum
Actually the composition such as measurement is:3.62%Si, 1.41%Cu, 0.4%Zn, 0.271%Zr, 0.0084 %Sr, 1.55%Fe, surplus
For aluminium and impurity element.
The high tough corrosion-resistant Al-Si-Cu systems Cast aluminium alloy payment organization of the Zr and Sr combined microalloyings of the present embodiment causes
It is close(Fig. 1), Si phases are tiny, and size is in granular form or corynebacterium in 1 ~ 2 μm, shape, and draw ratio is less than or equal to 2(Fig. 1, figure
2);Room temperature non-notch impact flexibility average value is 35.95J/cm2(Impacted by GB/T 229-2007 metal materials Charpy pendulu
Test method), impact toughness sample fracture is in the typical ductile rupture of dimple feature(Fig. 3);Intensity is 194.0475MPa, prolonged
It is 17.475% to stretch rate, and tensile sample fracture is also in the typical ductile rupture of dimple feature(Fig. 4);Hardness be 83.56667HV,
Electrical conductivity is 43.46625% IACS, uniform corrosion rate when soaking 93 h at a temperature of 37 DEG C in the 3.5% NaCl aqueous solution
(By GB 1024-88 Uniform Corrosion Method of Laboratory Immersion Test methods)For 0.216770566658317 mm/y, corrosion
Surface Si phase sizes are tiny(Fig. 5).
Embodiment two.
A kind of high tough corrosion-resistant low Si contents Al-Si-Cu systems cast aluminium alloy gold of Zr and Sr combined microalloyings, it is logical
Following methods are crossed to be prepared:
First by the pure Al of A00 grades(99.79%Al, 0.14%Fe, 0.04%Si)With Al-Si (89.62 %Al, 10.21%Si,
0.17% Fe) intermediate alloy fusing after be warming up to 850 ± 10 DEG C, then sequentially add Al-Cu (49.62%Al, 50.12%Cu,
0.15%Fe, 0.11%Si) intermediate alloy, close among Al-Zr (95.69%Al, 4.11%Zr, 0.20%Fe, 0.10%Si)
Gold and Al-Sr (89.86%Al, 9.89%Sr, 0.15%Fe, 0.10%Si) intermediate alloy, intermediate alloy to be added and pure Al
Pure Zn is added after thawing;After all intermediate alloys and metal molten, 750 ± 10 DEG C are adjusted the temperature to, adds carbon trichloride essence
Degasification is refined until being escaped without gas, removing slag and pouring into after standing 5~10 min of insulation is preheated to 300 ± 10 DEG C of metal die
Middle casting ingot;Obtain a kind of high tough corrosion-resistant Al-Si-Cu systems cast aluminium alloy gold of Zr and Sr combined microalloyings.
The high tough corrosion-resistant Al-Si-Cu systems cast aluminium alloy gold of the Zr and Sr combined microalloyings of the present embodiment is through spectrum
Actually the composition such as measurement is:3.65%Si, 1.43%Cu, 0.397%Zn, 0.271%Zr, 0.0085%Sr, 1.58%Fe, it is remaining
Measure as aluminium and impurity element.
The high tough corrosion-resistant Al-Si-Cu systems Cast aluminium alloy payment organization of the Zr and Sr combined microalloyings of the present embodiment causes
Close, Si phases are tiny, and size is in granular form or corynebacterium in 1 ~ 2 μm, shape, and draw ratio is less than or equal to 2;Room temperature non-notch rushes
It is 37.4J/cm to hit toughness average value2(By GB/T 229-2007 metal material Charpy pendulum impact test methods), impact tough
Property style fracture be in dimple feature typical ductile rupture;Intensity is 195.933MPa, elongation percentage 17.76471%, and fracture is in
The typical ductile rupture of dimple feature;Hardness is 85.5HV, electrical conductivity is 43.25% IACS, in the 3.5% NaCl aqueous solution
Uniform corrosion rate during 93 h is soaked at a temperature of 37 DEG C(By GB 1024-88 Uniform Corrosion Method of Laboratory Immersion Test
Method)It is tiny for 0.22164217 mm/y, corrosion surface Si phase sizes.
Embodiment three.
A kind of high tough corrosion-resistant low Si contents Al-Si-Cu systems cast aluminium alloy gold of Zr and Sr combined microalloyings, it is logical
Following methods are crossed to be prepared:
First by the pure Al of A00 grades(99.79%Al, 0.14%Fe, 0.04%Si)With Al-Si (89.62 %Al, 10.21%Si,
0.17% Fe) intermediate alloy fusing after be warming up to 850 ± 10 DEG C, then sequentially add Al-Cu (49.62%Al, 50.12%Cu,
0.15%Fe, 0.11%Si) intermediate alloy, close among Al-Zr (95.69%Al, 4.11%Zr, 0.20%Fe, 0.10%Si)
Gold and Al-Sr (89.86%Al, 9.89%Sr, 0.15%Fe, 0.10%Si) intermediate alloy, intermediate alloy to be added and pure Al
Pure Zn is added after thawing;After all intermediate alloys and metal molten, 750 ± 10 DEG C are adjusted the temperature to, adds carbon trichloride essence
Degasification is refined until being escaped without gas, removing slag and pouring into after standing 5~10 min of insulation is preheated to 300 ± 10 DEG C of metal die
Middle casting ingot;Obtain a kind of high tough corrosion-resistant Al-Si-Cu systems cast aluminium alloy gold of Zr and Sr combined microalloyings.
The high tough corrosion-resistant Al-Si-Cu systems cast aluminium alloy gold of the Zr and Sr combined microalloyings of the present embodiment is through spectrum
Actually the composition such as measurement is:3.64%Si, 1.41 %Cu, 0.403%Zn, 0.271%Zr, 0.0085 %Sr, 1.54%Fe,
Surplus is aluminium and impurity element.
The high tough corrosion-resistant Al-Si-Cu systems Cast aluminium alloy payment organization of the Zr and Sr combined microalloyings of the present embodiment causes
Close, Si phases are tiny, and size is in granular form or corynebacterium in 1 ~ 2 μm, shape, and draw ratio is less than or equal to 2;Room temperature non-notch rushes
It is 34.5J/cm to hit toughness average value2(By GB/T 229-2007 metal material Charpy pendulum impact test methods), impact tough
Property style fracture be in dimple feature typical ductile rupture;Intensity is 192.162MPa, elongation percentage 17.29412%, fracture
In the typical ductile rupture of dimple feature;Hardness is 81HV, electrical conductivity is 44.115% IACS, in the 3.5% NaCl aqueous solution
Uniform corrosion rate during 93 h is soaked at a temperature of 37 DEG C(By GB 1024-88 Uniform Corrosion Method of Laboratory Immersion Test
Method)It is tiny for 0.21947358 mm/y, corrosion surface Si phase sizes.
Example IV(Quality).
A kind of high tough corrosion-resistant low Si contents Al-Si-Cu systems cast aluminium alloy gold of Zr and Sr combined microalloyings, it is logical
Following methods are crossed to be prepared:
First 850 ± 10 DEG C will be warming up to after the pure Al and 34.770 gram of Al-Si intermediate alloy fusing of 55.345 grams of A00 grades, then
2.773 grams of Al-Cu intermediate alloys, 6.618 grams of Al-Zr intermediate alloys and 0.084 gram of Al-Sr intermediate alloy are sequentially added, it is to be added
The intermediate alloy entered and pure Al add 0.410 gram of pure Zn after melting;After all intermediate alloys and metal molten, adjust the temperature to
750 ± 10 DEG C, carbon trichloride refining degasification is added until being escaped without gas, is removed slag and is poured into after standing 5~10 min of insulation
Ingot of casting is preheated in 300 DEG C of metal die;Obtain a kind of high tough corrosion-resistant Al- of Zr and Sr combined microalloyings
Si-Cu systems cast aluminium alloy gold.
The high tough corrosion-resistant Al-Si-Cu systems cast aluminium alloy gold of the Zr and Sr combined microalloyings of the present embodiment is through spectrum
Actually the composition such as measurement is:3.55%Si, 1.39%Cu, 0.410%Zn, 0.272%Zr, 0.0083 %Sr, 1.53%Fe, it is remaining
Measure as aluminium and impurity element.
The high tough corrosion-resistant Al-Si-Cu systems Cast aluminium alloy payment organization of the Zr and Sr combined microalloyings of the present embodiment causes
Close, Si phases are tiny, and size is in granular form or corynebacterium in 1 ~ 2 μm, shape, and draw ratio is less than or equal to 2;Room temperature non-notch rushes
It is 34.8J/cm to hit toughness average value2(By GB/T 229-2007 metal material Charpy pendulum impact test methods), impact tough
Property style fracture be in dimple feature typical ductile rupture;Intensity is 194.242MPa, elongation percentage 17.3859%, and fracture is in
The typical ductile rupture of dimple feature;Hardness is 85.1HV, electrical conductivity is 45.25% IACS, in the 3.5% NaCl aqueous solution
Uniform corrosion rate during 93 h is soaked at a temperature of 37 DEG C(By GB 1024-88 Uniform Corrosion Method of Laboratory Immersion Test
Method)It is tiny for 0.2234416 mm/y, corrosion surface Si phase sizes.The aluminium alloy of several common proportionings is only listed above
With when manufacture method, those skilled in the art can suitably adjust the proportioning of each component and strict according to examples detailed above
The high tough corrosion-resistant Al-Si-Cu systems casting of preferable Zr and Sr combined microalloyings can be obtained by carrying out manufacture by above-mentioned steps
Make aluminium alloy.
Part that the present invention does not relate to is same as the prior art or can be realized using prior art.
Claims (3)
1. a kind of high tough corrosion-resistant low Si contents Al-Si-Cu systems cast aluminium alloy gold of Zr and Sr combined microalloyings, its feature
It is:It is mainly by aluminium(Al), silicon(Si), copper(Cu), zinc(Zn), zirconium(Zr)And strontium(Sr)Composition, wherein, silicon(Si)Quality
Percentage is 3.55~3.65 %, copper(Cu)Mass percent be 1.39~1.43%, zinc(Zn)Mass percent be
0.397 ~ 0.403%, zirconium(Zr)Mass percent be 0.271~0.272%, strontium(Sr)Mass percent for 0.0083~
0.0085%, surplus is aluminium and a small amount of impurity element, and the mass percent sum of each component is 100%.
A kind of 2. high tough corrosion-resistant low Si contents Al-Si-Cu systems casting of the Zr and Sr combined microalloyings described in claim 1
The preparation method of aluminium alloy is made, it is characterized in that its preparation process includes successively:
(1)First, 850 ± 10 DEG C are warming up to after pure Al and Al-Si intermediate alloys are melted, is then sequentially added among Al-Cu
Alloy, Al-Zr intermediate alloys and Al-Sr intermediate alloys, intermediate alloy to be added and pure Al add pure Zn after melting;
(2)Secondly, after all intermediate alloys and metal molten, 750 ± 10 DEG C are adjusted the temperature to, carbon trichloride refining is added and removes
Until being escaped without gas, remove slag after 5~10 min of standing insulation and pour into be preheated in 300 DEG C of metal die is cast into gas
Ingot, that is, obtain the high tough corrosion-resistant low Si contents Al-Si-Cu cast aluminium alloy golds of Zr and Sr combined microalloyings.
3. preparation method according to claim 2, it is characterized in that in described Al-Si intermediate alloys Si mass percent
The mass percent that mass percent for Cu in 10.21%, Al-Cu intermediate alloys is Zr in 50.12%, Al-Zr intermediate alloys
Mass percent for Sr in 4.11%, Al-Sr intermediate alloys is 9.89%.
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CN108127099A (en) * | 2017-12-26 | 2018-06-08 | 中国兵器工业第五九研究所 | A kind of casting method of micro alloyed aluminium alloy |
CN110592439A (en) * | 2019-08-27 | 2019-12-20 | 江苏大学 | High-plasticity Al-Si-Cu series cast aluminum alloy and preparation method thereof |
CN110607471A (en) * | 2019-08-27 | 2019-12-24 | 江苏大学 | Sr, Zr and Ti ternary composite microalloyed Al-Si-Cu series cast aluminum alloy and preparation method thereof |
CN110607471B (en) * | 2019-08-27 | 2021-07-20 | 江苏大学 | Sr, Zr and Ti ternary composite microalloyed Al-Si-Cu series cast aluminum alloy and preparation method thereof |
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